feat: init container

Dockerfile

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+FROM golang:latest AS builder
+WORKDIR /app
+
+# https://tailscale.com/kb/1118/custom-derp-servers/
+RUN go install tailscale.com/cmd/derper@main
+
+FROM ubuntu
+WORKDIR /app
+
+ENV DEPR_HOSTNAME your-hostname.com
+COPY --from=builder /go/bin/derper .
+COPY entrypoint.sh /app/entrypoint.sh
+
+CMD ["/app/derper", "--hostname", "${DEPR_HOSTNAME}"]

README.md

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+# Derper
+
+# Setup
+
+> required: set env `DEPR_HOSTNAME` to your domain
+
+```bash
+docker run -e DEPR_HOSTNAME=derper.your-domain.com fredliang/derper
+```

entrypoint.sh

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+#!/bin/sh
+/app/derper --hostname ${DEPR_HOSTNAME}